diff --git a/src/Eloquent/Model.php b/src/Eloquent/Model.php
index 2d985f6..1c66f76 100644
--- a/src/Eloquent/Model.php
+++ b/src/Eloquent/Model.php
@@ -155,7 +155,7 @@ public function getAttribute($key)
         }
 
         // Dot notation support.
-        if (Str::contains($key, '.') && Arr::has($this->attributes, $key)) {
+        if (str_contains($key, '.') && Arr::has($this->attributes, $key)) {
             return $this->getAttributeValue($key);
         }
 
@@ -177,7 +177,7 @@ public function getAttribute($key)
     protected function getAttributeFromArray($key)
     {
         // Support keys in dot notation.
-        if (Str::contains($key, '.')) {
+        if (str_contains($key, '.')) {
             return Arr::get($this->attributes, $key);
         }
 
@@ -195,7 +195,7 @@ public function setAttribute($key, $value)
 
             $value = $builder->convertKey($value);
         } // Support keys in dot notation.
-        elseif (Str::contains($key, '.')) {
+        elseif (str_contains($key, '.')) {
             // Store to a temporary key, then move data to the actual key
             $uniqueKey = uniqid($key);
             parent::setAttribute($uniqueKey, $value);
diff --git a/src/Query/Builder.php b/src/Query/Builder.php
index dd448ed..14036ae 100644
--- a/src/Query/Builder.php
+++ b/src/Query/Builder.php
@@ -617,7 +617,7 @@ public function insertGetId(array $values, $sequence = null)
     public function update(array $values, array $options = [])
     {
         // Use $set as default operator.
-        if (! Str::startsWith(key($values), '$')) {
+        if (! str_starts_with(key($values), '$')) {
             $values = ['$set' => $values];
         }
 
@@ -951,7 +951,7 @@ protected function compileWheres(): array
             }
 
             // Convert id's.
-            if (isset($where['column']) && ($where['column'] == '_id' || Str::endsWith($where['column'], '._id'))) {
+            if (isset($where['column']) && ($where['column'] == '_id' || str_ends_with($where['column'], '._id'))) {
                 // Multiple values.
                 if (isset($where['values'])) {
                     foreach ($where['values'] as &$value) {